Wide-coverage and Efficient NIR Emission from Single-component Nanophosphors through Shaping Multiple Metal-halide...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photonics

Background:

• Near-infrared (NIR) emitting phosphors are crucial for applications like sensing and night vision.
• Developing efficient and wide-coverage NIR phosphors remains a significant challenge in materials science.

Purpose of the Study:

• To synthesize and characterize novel single-component lanthanide-doped Cs2M(In0.95Sb0.05)Cl6 nanocrystals for efficient NIR emission.
• To investigate the impact of alkali metal substitution on the crystal structure and luminescent properties of the phosphors.

Main Methods:

• Synthesis of Cs2M(In0.95Sb0.05)Cl6 nanocrystals doped with lanthanide ions.
• Spectroscopic investigations including photoluminescence quantum yield measurements.
• Judd-Ofelt theoretical calculations to understand optical transitions.

Main Results:

• Achieved wide-coverage NIR emission spanning 850-1650 nm with a high photoluminescence quantum yield of 20.3%.
• Demonstrated that alkali metal substitution shapes metal halide octahedra, enhancing f-f transitions and energy transfer efficiency.
• Fabricated NIR LEDs utilizing Sm3+, Nd3+, Er3+-tridoped nanocrystals for multiplex gas sensing and night-vision applications.

Conclusions:

• Single-component lanthanide-doped Cs2M(In0.95Sb0.05)Cl6 nanocrystals offer a promising route to efficient and wide-coverage NIR emission.
• The developed phosphors are suitable for practical applications in multiplex gas sensing and night vision.
• Crystal structure modification through alkali metal substitution is key to optimizing NIR phosphor performance.